Add forward extremities endpoint to rooms admin API #9062

jaywink · 2021-01-09T21:11:17Z

Enables querying and deleting forward extremities from rooms via the admin API.

When deleting, the get_latest_event_ids_in_room cache is invalidated, so that the server does not need to be restarted.

Signed-off-by: Jason Robinson <mail@jasonrobinson.me>

GET /_synapse/admin/v1/rooms/<identifier>/forward_extremities now gets forward extremities for a room, returning count and the list of extremities. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Also run linter. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Signed-off-by: Jason Robinson <jasonr@matrix.org>

clokep

Looks reasonable overall!

synapse/storage/databases/main/events_forward_extremities.py

docs/admin_api/rooms.md

clokep · 2021-01-11T14:15:42Z

docs/admin_api/rooms.md

+
+## Check for forward extremities
+
+To check the status of forward extremities for a room:


What sort of situations would you use this in? Is the state group useful?

No, probably not particularly, except maybe for developers. I did think of returning just a count, but it felt that since the information "is there", it felt unnecessary to not return results as well.

My understanding of the needs for this API endpoint from an operational point of view is mainly to see the count, though I would maybe check with the EMS ops team first to confirm.

I suspect that's just internal state then and not worth returning. @erikjohnston do you see any value in returning those?

I've sometimes used the state group as a proxy for how big the state difference was between extremities were, but it's a bad heuristic. I think a more useful one would probably be depth and received_ts, as that'll give you a better way of looking for stuck extremities

Do we consider those to be useful in this admin API? I guess the options are:

keep as is

remove state_group

remove state_group, add depth and received_ts

remove everything, just return a count

something else? :)

I don't have enough experience on the extremities to vote really.

I think adding depth and received_ts is probably the right thing

synapse/storage/databases/main/events_forward_extremities.py

clokep · 2021-01-11T14:23:52Z

synapse/storage/databases/main/events_forward_extremities.py

+            except KeyError:
+                msg = "No forward extremity event found for room %s" % room_id
+                logger.warning(msg)
+                raise SynapseError(400, msg)


I think we usually try to not raise synapse errors from the database layer, but I'm not finding a much better solution at the moment.

Yeah I felt annoyed at this too, but didn't feel there was much to do, without separating the queries into separate transactions at least. I guess one thing could be raising some non-http error and then catching that in the servlet to raise a SynapseError? I didn't do it since I saw some other places use the SynapseError in db code.

clokep · 2021-01-11T14:24:34Z

Is there a current issue that this is working around?

synapse/storage/databases/main/events_forward_extremities.py

erikjohnston · 2021-01-11T14:35:09Z

A couple of notes:

This should have a big health warning on it, as if its called without thought it can lead to room takeover attacks where someone can change the servers view of the current state
There's a race where this won't work for busy rooms, as we read the extremities in one transaction and then write them in another (this happens if you have really busy room)

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

* docs updates * prettify SQL * add missing copyright * cursor_to_dict * update touched files copyright years Signed-off-by: Jason Robinson <jasonr@matrix.org>

As per feedback. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Signed-off-by: Jason Robinson <jasonr@matrix.org>

jaywink · 2021-01-12T09:01:11Z

This should have a big health warning on it, as if its called without thought it can lead to room takeover attacks where someone can change the servers view of the current state

Hmm, I'm wondering what kind of warning we can put while still enabling this kind of API call, if there is potential for users to mess up their servers?

On the other hand, this is something that EMS ops has needed to do sometimes, which is why this PR exists to make the operations easier.

Just a generic "WARNING: Please ensure you know what you're doing and have read the related issue #1760 " etc?

There's a race where this won't work for busy rooms, as we read the extremities in one transaction and then write them in another (this happens if you have really busy room)

For this PR I had to dig into how the db layer works to understand when commits happen and I was under the understanding (from code) that this will all happen in one transaction? We do two selects but AFAICT the commit happens only after both of them, given both statements are done inside a single runInteraction call?

Note the GET API is just separate to get some kind of generic status on the situation. Not all admins will have for example Prometheus metrics enabled. Of course ideally a GET endpoint to get "rooms with most extremities" might be more useful, but I was going to do that possibly next.

erikjohnston · 2021-01-18T14:55:39Z

This should have a big health warning on it, as if its called without thought it can lead to room takeover attacks where someone can change the servers view of the current state

Hmm, I'm wondering what kind of warning we can put while still enabling this kind of API call, if there is potential for users to mess up their servers?

On the other hand, this is something that EMS ops has needed to do sometimes, which is why this PR exists to make the operations easier.

Just a generic "WARNING: Please ensure you know what you're doing and have read the related issue #1760 " etc?

That'd probably be fine, plus saying that the API should absolutely not be run automatically.

There's a race where this won't work for busy rooms, as we read the extremities in one transaction and then write them in another (this happens if you have really busy room)

For this PR I had to dig into how the db layer works to understand when commits happen and I was under the understanding (from code) that this will all happen in one transaction? We do two selects but AFAICT the commit happens only after both of them, given both statements are done inside a single runInteraction call?

Note the GET API is just separate to get some kind of generic status on the situation. Not all admins will have for example Prometheus metrics enabled. Of course ideally a GET endpoint to get "rooms with most extremities" might be more useful, but I was going to do that possibly next.

We precompute the extremities and state and then call the persist events transaction, c.f. https://github.com/matrix-org/synapse/blob/develop/synapse/storage/persist_events.py#L414-L419

clokep

Looks like @erikjohnston left some feedback that needs to be handled already, so I'm going to mark this as request changes.

Also add a warning on the admin API documentation. Signed-off-by: Jason Robinson <jasonr@matrix.org>

jaywink · 2021-01-23T19:42:40Z

Have updated 👍

jaywink · 2021-01-25T11:43:02Z

Not entirely sure if the test failure is related to the PR?

clokep · 2021-01-25T12:46:21Z

Not entirely sure if the test failure is related to the PR?

It is not, but can you merge develop into this branch to fix it?

…ard-extremities

jaywink · 2021-01-25T13:56:33Z

It is not, but can you merge develop into this branch to fix it?

Done.

erikjohnston

I think otherwise this looks OK

synapse/storage/databases/main/events_forward_extremities.py

…ard-extremities

clokep · 2021-01-25T20:00:28Z

I merged develop again, which should fix the build issue.

Co-authored-by: Erik Johnston <erik@matrix.org>

# Conflicts: # synapse/rest/admin/__init__.py

jaywink · 2021-01-26T08:16:10Z

Conflict resolved and PR review addressed.

synapse/storage/databases/main/events_forward_extremities.py

Signed-off-by: Jason Robinson <jasonr@matrix.org>

erikjohnston

I think this looks good now, thanks!

jaywink · 2021-01-26T10:57:34Z

Merging as @clokep 's "changes requested" review was about Erik's comments, which were addressed and approved. Thanks for the review!

@Bubu

Synapse 1.28.0 (2021-02-25) =========================== Note that this release drops support for ARMv7 in the official Docker images, due to repeated problems building for ARMv7 (and the associated maintenance burden this entails). This release also fixes the documentation included in v1.27.0 around the callback URI for SAML2 identity providers. If your server is configured to use single sign-on via a SAML2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes. Internal Changes ---------------- - Revert change in v1.28.0rc1 to remove the deprecated SAML endpoint. ([\#9474](matrix-org/synapse#9474)) Synapse 1.28.0rc1 (2021-02-19) ============================== Removal warning --------------- The v1 list accounts API is deprecated and will be removed in a future release. This API was undocumented and misleading. It can be replaced by the [v2 list accounts API](https://github.com/matrix-org/synapse/blob/release-v1.28.0/docs/admin_api/user_admin_api.rst#list-accounts), which has been available since Synapse 1.7.0 (2019-12-13). Please check if you're using any scripts which use the admin API and replace `GET /_synapse/admin/v1/users/<user_id>` with `GET /_synapse/admin/v2/users`. Features -------- - New admin API to get the context of an event: `/_synapse/admin/rooms/{roomId}/context/{eventId}`. ([\#9150](matrix-org/synapse#9150)) - Further improvements to the user experience of registration via single sign-on. ([\#9300](matrix-org/synapse#9300), [\#9301](matrix-org/synapse#9301)) - Add hook to spam checker modules that allow checking file uploads and remote downloads. ([\#9311](matrix-org/synapse#9311)) - Add support for receiving OpenID Connect authentication responses via form `POST`s rather than `GET`s. ([\#9376](matrix-org/synapse#9376)) - Add the shadow-banning status to the admin API for user info. ([\#9400](matrix-org/synapse#9400)) Bugfixes -------- - Fix long-standing bug where sending email notifications would fail for rooms that the server had since left. ([\#9257](matrix-org/synapse#9257)) - Fix bug introduced in Synapse 1.27.0rc1 which meant the "session expired" error page during SSO registration was badly formatted. ([\#9296](matrix-org/synapse#9296)) - Assert a maximum length for some parameters for spec compliance. ([\#9321](matrix-org/synapse#9321), [\#9393](matrix-org/synapse#9393)) - Fix additional errors when previewing URLs: "AttributeError 'NoneType' object has no attribute 'xpath'" and "ValueError: Unicode strings with encoding declaration are not supported. Please use bytes input or XML fragments without declaration.". ([\#9333](matrix-org/synapse#9333)) - Fix a bug causing Synapse to impose the wrong type constraints on fields when processing responses from appservices to `/_matrix/app/v1/thirdparty/user/{protocol}`. ([\#9361](matrix-org/synapse#9361)) - Fix bug where Synapse would occasionally stop reconnecting to Redis after the connection was lost. ([\#9391](matrix-org/synapse#9391)) - Fix a long-standing bug when upgrading a room: "TypeError: '>' not supported between instances of 'NoneType' and 'int'". ([\#9395](matrix-org/synapse#9395)) - Reduce the amount of memory used when generating the URL preview of a file that is larger than the `max_spider_size`. ([\#9421](matrix-org/synapse#9421)) - Fix a long-standing bug in the deduplication of old presence, resulting in no deduplication. ([\#9425](matrix-org/synapse#9425)) - The `ui_auth.session_timeout` config option can now be specified in terms of number of seconds/minutes/etc/. Contributed by Rishabh Arya. ([\#9426](matrix-org/synapse#9426)) - Fix a bug introduced in v1.27.0: "TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType." related to the user directory. ([\#9428](matrix-org/synapse#9428)) Updates to the Docker image --------------------------- - Drop support for ARMv7 in Docker images. ([\#9433](matrix-org/synapse#9433)) Improved Documentation ---------------------- - Reorganize CHANGELOG.md. ([\#9281](matrix-org/synapse#9281)) - Add note to `auto_join_rooms` config option explaining existing rooms must be publicly joinable. ([\#9291](matrix-org/synapse#9291)) - Correct name of Synapse's service file in TURN howto. ([\#9308](matrix-org/synapse#9308)) - Fix the braces in the `oidc_providers` section of the sample config. ([\#9317](matrix-org/synapse#9317)) - Update installation instructions on Fedora. ([\#9322](matrix-org/synapse#9322)) - Add HTTP/2 support to the nginx example configuration. Contributed by David Vo. ([\#9390](matrix-org/synapse#9390)) - Update docs for using Gitea as OpenID provider. ([\#9404](matrix-org/synapse#9404)) - Document that pusher instances are shardable. ([\#9407](matrix-org/synapse#9407)) - Fix erroneous documentation from v1.27.0 about updating the SAML2 callback URL. ([\#9434](matrix-org/synapse#9434)) Deprecations and Removals ------------------------- - Deprecate old admin API `GET /_synapse/admin/v1/users/<user_id>`. ([\#9429](matrix-org/synapse#9429)) Internal Changes ---------------- - Fix 'object name reserved for internal use' errors with recent versions of SQLite. ([\#9003](matrix-org/synapse#9003)) - Add experimental support for running Synapse with PyPy. ([\#9123](matrix-org/synapse#9123)) - Deny access to additional IP addresses by default. ([\#9240](matrix-org/synapse#9240)) - Update the `Cursor` type hints to better match PEP 249. ([\#9299](matrix-org/synapse#9299)) - Add debug logging for SRV lookups. Contributed by @Bubu. ([\#9305](matrix-org/synapse#9305)) - Improve logging for OIDC login flow. ([\#9307](matrix-org/synapse#9307)) - Share the code for handling required attributes between the CAS and SAML handlers. ([\#9326](matrix-org/synapse#9326)) - Clean up the code to load the metadata for OpenID Connect identity providers. ([\#9362](matrix-org/synapse#9362)) - Convert tests to use `HomeserverTestCase`. ([\#9377](matrix-org/synapse#9377), [\#9396](matrix-org/synapse#9396)) - Update the version of black used to 20.8b1. ([\#9381](matrix-org/synapse#9381)) - Allow OIDC config to override discovered values. ([\#9384](matrix-org/synapse#9384)) - Remove some dead code from the acceptance of room invites path. ([\#9394](matrix-org/synapse#9394)) - Clean up an unused method in the presence handler code. ([\#9408](matrix-org/synapse#9408)) Synapse 1.27.0 (2021-02-16) =========================== Note that this release includes a change in Synapse to use Redis as a cache ─ as well as a pub/sub mechanism ─ if Redis support is enabled for workers. No action is needed by server administrators, and we do not expect resource usage of the Redis instance to change dramatically. This release also changes the callback URI for OpenID Connect (OIDC) and SAML2 identity providers. If your server is configured to use single sign-on via an OIDC/OAuth2 or SAML2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes. This release also changes escaping of variables in the HTML templates for SSO or email notifications. If you have customised these templates, please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes. Bugfixes -------- - Fix building Docker images for armv7. ([\#9405](matrix-org/synapse#9405)) Synapse 1.27.0rc2 (2021-02-11) ============================== Features -------- - Further improvements to the user experience of registration via single sign-on. ([\#9297](matrix-org/synapse#9297)) Bugfixes -------- - Fix ratelimiting introduced in v1.27.0rc1 for invites to respect the `ratelimit` flag on application services. ([\#9302](matrix-org/synapse#9302)) - Do not automatically calculate `public_baseurl` since it can be wrong in some situations. Reverts behaviour introduced in v1.26.0. ([\#9313](matrix-org/synapse#9313)) Improved Documentation ---------------------- - Clarify the sample configuration for changes made to the template loading code. ([\#9310](matrix-org/synapse#9310)) Synapse 1.27.0rc1 (2021-02-02) ============================== Features -------- - Add an admin API for getting and deleting forward extremities for a room. ([\#9062](matrix-org/synapse#9062)) - Add an admin API for retrieving the current room state of a room. ([\#9168](matrix-org/synapse#9168)) - Add experimental support for allowing clients to pick an SSO Identity Provider ([MSC2858](matrix-org/matrix-spec-proposals#2858)). ([\#9183](matrix-org/synapse#9183), [\#9242](matrix-org/synapse#9242)) - Add an admin API endpoint for shadow-banning users. ([\#9209](matrix-org/synapse#9209)) - Add ratelimits to the 3PID `/requestToken` APIs. ([\#9238](matrix-org/synapse#9238)) - Add support to the OpenID Connect integration for adding the user's email address. ([\#9245](matrix-org/synapse#9245)) - Add ratelimits to invites in rooms and to specific users. ([\#9258](matrix-org/synapse#9258)) - Improve the user experience of setting up an account via single-sign on. ([\#9262](matrix-org/synapse#9262), [\#9272](matrix-org/synapse#9272), [\#9275](matrix-org/synapse#9275), [\#9276](matrix-org/synapse#9276), [\#9277](matrix-org/synapse#9277), [\#9286](matrix-org/synapse#9286), [\#9287](matrix-org/synapse#9287)) - Add phone home stats for encrypted messages. ([\#9283](matrix-org/synapse#9283)) - Update the redirect URI for OIDC authentication. ([\#9288](matrix-org/synapse#9288)) Bugfixes -------- - Fix spurious errors in logs when deleting a non-existant pusher. ([\#9121](matrix-org/synapse#9121)) - Fix a long-standing bug where Synapse would return a 500 error when a thumbnail did not exist (and auto-generation of thumbnails was not enabled). ([\#9163](matrix-org/synapse#9163)) - Fix a long-standing bug where an internal server error was raised when attempting to preview an HTML document in an unknown character encoding. ([\#9164](matrix-org/synapse#9164)) - Fix a long-standing bug where invalid data could cause errors when calculating the presentable room name for push. ([\#9165](matrix-org/synapse#9165)) - Fix bug where we sometimes didn't detect that Redis connections had died, causing workers to not see new data. ([\#9218](matrix-org/synapse#9218)) - Fix a bug where `None` was passed to Synapse modules instead of an empty dictionary if an empty module `config` block was provided in the homeserver config. ([\#9229](matrix-org/synapse#9229)) - Fix a bug in the `make_room_admin` admin API where it failed if the admin with the greatest power level was not in the room. Contributed by Pankaj Yadav. ([\#9235](matrix-org/synapse#9235)) - Prevent password hashes from getting dropped if a client failed threepid validation during a User Interactive Auth stage. Removes a workaround for an ancient bug in Riot Web <v0.7.4. ([\#9265](matrix-org/synapse#9265)) - Fix single-sign-on when the endpoints are routed to synapse workers. ([\#9271](matrix-org/synapse#9271)) Improved Documentation ---------------------- - Add docs for using Gitea as OpenID provider. ([\#9134](matrix-org/synapse#9134)) - Add link to Matrix VoIP tester for turn-howto. ([\#9135](matrix-org/synapse#9135)) - Add notes on integrating with Facebook for SSO login. ([\#9244](matrix-org/synapse#9244)) Deprecations and Removals ------------------------- - The `service_url` parameter in `cas_config` is deprecated in favor of `public_baseurl`. ([\#9199](matrix-org/synapse#9199)) - Add new endpoint `/_synapse/client/saml2` for SAML2 authentication callbacks, and deprecate the old endpoint `/_matrix/saml2`. ([\#9289](matrix-org/synapse#9289)) Internal Changes ---------------- - Add tests to `test_user.UsersListTestCase` for List Users Admin API. ([\#9045](matrix-org/synapse#9045)) - Various improvements to the federation client. ([\#9129](matrix-org/synapse#9129)) - Speed up chain cover calculation when persisting a batch of state events at once. ([\#9176](matrix-org/synapse#9176)) - Add a `long_description_type` to the package metadata. ([\#9180](matrix-org/synapse#9180)) - Speed up batch insertion when using PostgreSQL. ([\#9181](matrix-org/synapse#9181), [\#9188](matrix-org/synapse#9188)) - Emit an error at startup if different Identity Providers are configured with the same `idp_id`. ([\#9184](matrix-org/synapse#9184)) - Improve performance of concurrent use of `StreamIDGenerators`. ([\#9190](matrix-org/synapse#9190)) - Add some missing source directories to the automatic linting script. ([\#9191](matrix-org/synapse#9191)) - Precompute joined hosts and store in Redis. ([\#9198](matrix-org/synapse#9198), [\#9227](matrix-org/synapse#9227)) - Clean-up template loading code. ([\#9200](matrix-org/synapse#9200)) - Fix the Python 3.5 old dependencies build. ([\#9217](matrix-org/synapse#9217)) - Update `isort` to v5.7.0 to bypass a bug where it would disagree with `black` about formatting. ([\#9222](matrix-org/synapse#9222)) - Add type hints to handlers code. ([\#9223](matrix-org/synapse#9223), [\#9232](matrix-org/synapse#9232)) - Fix Debian package building on Ubuntu 16.04 LTS (Xenial). ([\#9254](matrix-org/synapse#9254)) - Minor performance improvement during TLS handshake. ([\#9255](matrix-org/synapse#9255)) - Refactor the generation of summary text for email notifications. ([\#9260](matrix-org/synapse#9260)) - Restore PyPy compatibility by not calling CPython-specific GC methods when under PyPy. ([\#9270](matrix-org/synapse#9270))

jaywink added 6 commits January 7, 2021 23:01

Add forward extremities endpoint to rooms admin API

b849e46

GET /_synapse/admin/v1/rooms/<identifier>/forward_extremities now gets forward extremities for a room, returning count and the list of extremities. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Move unknown room ID error into resolve_room_id

c91045f

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Add Rooms admin forward extremities DELETE endpoint

85c0999

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Implement clearing cache after deleting forward extremities

90ad4d4

Also run linter. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Merge branch 'develop' into jaywink/admin-forward-extremities

2eb421b

Add changelog and admin API docs

e2c16ed

Signed-off-by: Jason Robinson <jasonr@matrix.org>

dklimpel mentioned this pull request Jan 10, 2021

Forward extremities accumulate and lead to poor performance #1760

Closed

6 tasks

Don't try to use f-strings

b52fb70

Signed-off-by: Jason Robinson <jasonr@matrix.org>

erikjohnston requested a review from a team January 11, 2021 10:05

clokep reviewed Jan 11, 2021

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jaywink and others added 4 commits January 11, 2021 23:05

Clarify rooms.md

0b77329

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

Address pr feedback

da16d06

* docs updates * prettify SQL * add missing copyright * cursor_to_dict * update touched files copyright years Signed-off-by: Jason Robinson <jasonr@matrix.org>

Simplify delete_forward_extremities_for_room_txn SQL

49c619a

As per feedback. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Remove trailing whitespace to appease the linter

c177faf

Signed-off-by: Jason Robinson <jasonr@matrix.org>

jaywink requested review from erikjohnston and clokep January 12, 2021 09:08

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clokep removed the request for review from erikjohnston January 22, 2021 19:02

jaywink added 2 commits January 23, 2021 21:34

Add depth and received_ts to forward_extremities admin API response

930ba00

Also add a warning on the admin API documentation. Signed-off-by: Jason Robinson <jasonr@matrix.org>

Merge branch 'develop' into jaywink/admin-forward-extremities

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jaywink requested review from erikjohnston and clokep January 23, 2021 19:42

Merge remote-tracking branch 'origin/develop' into jaywink/admin-forw…

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…ard-extremities

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Merge remote-tracking branch 'origin/develop' into jaywink/admin-forw…

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…ard-extremities

jaywink and others added 2 commits January 26, 2021 10:13

Make natural join inner join

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Co-authored-by: Erik Johnston <erik@matrix.org>

Merge branch 'develop' into jaywink/admin-forward-extremities

cee4010

# Conflicts: # synapse/rest/admin/__init__.py

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Fix get forward extremities query

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Signed-off-by: Jason Robinson <jasonr@matrix.org>

jaywink requested a review from erikjohnston January 26, 2021 08:21

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jaywink merged commit e5b659e into develop Jan 26, 2021

jaywink deleted the jaywink/admin-forward-extremities branch January 26, 2021 10:57

erikjohnston mentioned this pull request Apr 19, 2022

Fix returned count of delete extremities admin API #12496

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Add forward extremities endpoint to rooms admin API #9062

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		## Check for forward extremities

		To check the status of forward extremities for a room:

Add forward extremities endpoint to rooms admin API #9062

Add forward extremities endpoint to rooms admin API #9062

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